deps(example): bump eslint-config-next

Bumps the dependencies group in /examples/nextjs-server-actions with 1 update: [eslint-config-next](https://github.com/vercel/next.js/tree/HEAD/packages/eslint-config-next).


Updates `eslint-config-next` from 15.0.3 to 15.0.4
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/commits/v15.0.4/packages/eslint-config-next)

---
updated-dependencies:
- dependency-name: eslint-config-next
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>

examples/nextjs-server-actions/package.json

@@ -20,6 +20,6 @@
     "@types/react": "^18",
     "@types/react-dom": "^18",
     "eslint": "^8",
-    "eslint-config-next": "15.0.3"
+    "eslint-config-next": "15.0.4"
   }
 }